package org.jaronsource.framework.plugins.security.validatecode;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * 验证码生成器
 * 
 * @author dsna
 * 
 */
public class ValidateCode {

	// 图片的宽度。
	private int width = 160;
	// 图片的高度。
	private int height = 40;
	// 验证码字符个数
	private int codeCount = 4;
	// 验证码干扰线数
	private int lineCount = 50;
	// 验证码
	private String code = null;
	// 验证码图片Buffer
	private BufferedImage buffImg = null;

	private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

	public ValidateCode() {
		this.createCode();
	}

	/**
	 * 
	 * @param width 图片宽
	 * @param height 图片高
	 */
	public ValidateCode(	int width, int height ) {
		this.width = width;
		this.height = height;
		this.createCode();
	}

	/**
	 * 
	 * @param width 图片宽
	 * @param height 图片高
	 * @param codeCount 字符个数
	 * @param lineCount 干扰线条数
	 */
	public ValidateCode(	int width, int height, int codeCount, int lineCount ) {
		this.width = width;
		this.height = height;
		this.codeCount = codeCount;
		this.lineCount = lineCount;
		this.createCode();
	}

	public void createCode() {
		int x = 0, fontHeight = 0, codeY = 0;
		int red = 0, green = 0, blue = 0;

		x = width / ( codeCount + 2 );// 每个字符的宽度
		fontHeight = height - 2;// 字体的高度
		codeY = height - 4;

		// 图像buffer
		buffImg = new BufferedImage( width, height, BufferedImage.TYPE_INT_RGB );
		Graphics2D g = buffImg.createGraphics();
		// 生成随机数
		Random random = new Random();
		// 将图像填充为白色
		g.setColor( Color.WHITE );
		g.fillRect( 0, 0, width, height );
		// 创建字体
		ImgFontByte imgFont = new ImgFontByte();
		Font font = imgFont.getFont( fontHeight );
		g.setFont( font );

		for ( int i = 0; i < lineCount; i++ ) {
			int xs = random.nextInt( width );
			int ys = random.nextInt( height );
			int xe = xs + random.nextInt( width / 8 );
			int ye = ys + random.nextInt( height / 8 );
			red = random.nextInt( 255 );
			green = random.nextInt( 255 );
			blue = random.nextInt( 255 );
			g.setColor( new Color( red, green, blue ) );
			g.drawLine( xs, ys, xe, ye );
		}

		// randomCode记录随机产生的验证码
		StringBuffer randomCode = new StringBuffer();
		// 随机产生codeCount个字符的验证码。
		for ( int i = 0; i < codeCount; i++ ) {
			String strRand = String.valueOf( codeSequence[random.nextInt( codeSequence.length )] );
			// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
			red = random.nextInt( 90 );
			green = random.nextInt( 90 );
			blue = random.nextInt( 90 );
			g.setColor( new Color( red, green, blue ) );
			g.drawString( strRand, ( i + 1 ) * x, codeY );
			// 将产生的四个随机数组合在一起。
			randomCode.append( strRand );
		}
		// 将四位数字的验证码保存到Session中。
		code = randomCode.toString();
	}

	public void write( String path ) throws IOException {
		OutputStream sos = new FileOutputStream( path );
		this.write( sos );
	}

	public void write( OutputStream sos ) throws IOException {
		ImageIO.write( buffImg, "png", sos );
		sos.close();
	}

	public BufferedImage getBuffImg() {
		return buffImg;
	}

	public String getCode() {
		return code;
	}
}
